Usually up to a week: Hand foot mouth can be contagious up to a week from onset of symptoms mainly through respiratory secretions. However the virus can be shed in the stool for a longer period. So people who change the diapers for infants have to be careful for up to two weeks.
Answered 9/28/2016
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See below: From just before you start breaking out till you stop breaking out.
Answered 9/21/2018
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